Magneto ignition apparatus



Jan. 9, 1934. w. WALTHER r-:r AL 1,943,249

MAGNETO IGNIT ION APPARATUS .Filed Feb. 12. 1932 o if@ Patented Jan. 9,1934 PATENT ortica 1,943,249 MAGNETo IGNITION APPARATUS Wilhelm Walther,Stuttgart,

and Heinrich Bischoff, Stuttgart-Botnang, Germany, assignors to RobertBosch Aktiengesellschaft,

Stuttgart, Germany Application February 12, 1932, Serial No. 592,646,

and in Germany February 21, 1931 Y Claims. 101.123.4449) The presentinvention relates to magneto ignition 4apparatus having a rotary magnetand stationary armature coil, in which the distributor disc is drivenfrom the shaft: of the magnet.

l The object of the invention is to produce a magneto which can beconstructed of short length in an axial direction, and the interrupterof which'is so arranged that it is protected against carbon dust orozone from the distributor, according as to whether the magneto isfitted withl a slip'- ring distributor or a spark-gap distributor.

, This object is attained, according to the invention, in that theinterrupter is arranged in a com-V partment which contains theinterrupter, the amature and the rotary magnet, which compartment iscompletely separated from the distributor compartment by a -wall. theinterrupter being mounted on the shaft of the distributor.

In a known magneto the interrupter is also mounted on the shaft of thedistributor, but it is arranged together with the distributor in thesame compartment, so that itis exposed to the carbon dust from thedistributor. l

An example of construction of ythe invention is illustrated in theaccompanying drawing, in which:-

Figure 1 is a sectional elevation voi a magneto.

Figure 2 is a front elevation of the interrupter.

'Figure 3 a view of the adjusting arrangement of the stationaryinterrupter contact, as seen fromabove.

Figure 4 a section on the line A-A of Figure 3.

The rotary magnet 1 is mounted in the ball bearing 2 in the bearingcover 3 and in the ball bearing 4 housed in the casing 5. Felt rings 6are provided on the inner side. of the ball bearing and these felt ringsrub on the armature shaft 7. The winding 8, with the armature core 9,and the amature shanks 10 are arranged in the usual manner above andclose to the rotor. In th'e front wall 11 of the casing 5 is a hollowshaft 12,

and secured in this the rotating distributor pieceA 13 is mounted. Thebearing bore is provided with a bush 14 in which the hollow shaft 12rotates. The toothed wheel 15 of the distributor is keyed ,on the hollowshaft 12 by means of the key 16. 'Ihe toothed wheel of thel distributoris in engagementlwith the toothed wheel 17 mounted on the 50 armatureshaft.

` The distributor. piece 13'consists of the disc 18,

`-"`and`.the extension 20 ofthe distributor carrying the distributor pin19. The distributor pin is con- -1 A= nected at one end with the finger21, and against 55,- its other end bears aleaf-spring 22, which isconnected to one, end of the high tension winding 8 of the armature. p

'The supporting plate 23L of the interrupter is revolubly mounted bymeans of an annular collar v24 in a bearing ring 25 of the casing wallr1. On 50 the interrupter plate is secured the stationary contact 26,the rocking lever 27 with the contact 28 and the condenser 29. `Theinterrupter plate has two slots 30 through which pass two ,screws 31screwed into the bearing ring and serving as stops for the interrupterplate. A spring 34 is riveted to the conducting lead 32 between thecondenser- 29 and the terminal 33 of the rocking contact 28, whichspring on adjusting the interrupter into` the retarded ignition endpositiontouches the contact screw 31 and thereby short-circuits themagneto. -The interrupter cam 40 is formed from the hollow shaft 12 ofthe distributor. It is lubricated by a lubricating pad 41, which ispressed against it by a spring 42.

The interrupter is adjusted by means of a plateshaped lever 35, which isfastened to a shaft 37 connected with the adjusting lever 36, and isprovided 4with a slot 38 in which engages a pin 89 mounted in theinterrupter plate. The plate has a longitudinal hole 50 through whichthe armature shaft 7 can pass.

The adjusting device of the stationary inter- K rupter contact is shownin Figures 2, 3 and 4. A nap 43 is bent from the upper edge of theinterg5 rupter plate 23, which flap ends in two flaps 44 and 45. Theflap part 44 is again bent upwards at right angles to the ilap 43,whilst the flap 45 projects out at right angles to the interrupterplate. This projecting edge 46 of the interrupter plate and the flaps 43and 44 lform a U-shaped channel for the holder 47 of the stationarycontact 26, in which the contact holder 47 can slide and be adjusted bythe screw 48. The projecting flap 45 serves at the same time as anelectrode for a safety spark gap, which is formed by this electrode andthe terminal 49 of the coil.

We declare that what we claim is:

1. A magneto ignition apparatus comprising a rotary magnet, a stationaryarmature, an interrupter, a chamber enclosing said magnet, armature andinterrupter, a distributor having an extension thereon, a cam mounted onsaid extension operating said interrupter, a chamber enclosing saiddistributor and a wall common to and separating said chambers.

2. A magneto ignition apparatus comprising a rotary magnet, a stationaryarmature, an interrupter, a chamber enclosing said magnet, armature andinterrupter, a distributor having an exl-l0 tension thereon, a cammounted on said extension operating said interrupter, a chamberenclosing said distributor, a wall common to and separating saidchambers and an adjusting lever for said interrupter having a slottherein embracing the shaft of said magnet and pivotally mounted in saidwall below the shaft of said magnet.

3. A magneto ignition apparatus comprising a rotary magnet, a stationaryarmature, an interrupter, a chamber enclosing said magnet, armature andinterrupter, a spring contact extending from the current lead to thecondenser, an earthed Contact engaging said spring contact when theinterrupter is shifted into the retarded ignition position, adistributor having an extensicn thereon, a cam mounted on said extensionoperating said interrupter, a chamber enclosing said distributor and awall common to and separating said chambers.

4. A magneto ignition apparatus as claimed in claim 1 in which a yokecarrying the stationary contact of the interrupter is guided in achannel formed by naps bent from a plate forming the base of theinterrupter.

5. A magneto ignition apparatus comprising a rotary magnet, a stationaryarmature, an interrupter, a chamber enclosing said magnet, armature andinterrupter, a plate forming a base for said interrupter, a ilap bentfrom said plate forming a safety spark gap with earth, a distributorhaving an extension thereon, a cam mounted on said extension operatingsaid interrupter, a chamber enclosing said distributor and a wall commonto and separating said chambers.

WILHELM WALTHER. HEINRICH BISCHOFF.

